Retainer for dental plates.



J. S. NAULDER.

RETAINER FOR DENTAL PLATES APPLICATION FILED JULY 16, 1912.

Patented Mar. 30, 1915.

2 SHEETSSHEET 1 7H5 NORRIS PETE THO.. WASHINGTON. D c.

J. S. NAULDER.

RETAINER FOR DENTAL PLATES.

APPLICATION FILED JULY 10, 1912.

1,1 33,570. Patented Mar. 30, 1915.

2 SHEETS-SHEET 2.

WITNESSES INVENTOR THE NORRIS PETERS C0 PHOTGJJTHQ, WASHING VON, D. c

citizen of the United nnrrnn STATES PATENT ornron.

JOHN S. NAULDER, OF PITTSBURGH, PENNSYLVANIA.

RETAINER FOR DENTAL PLATES.

To all whom it may concern:

Be it known that I JOHN S. NAULDER, a tates, and residing in the city ofPittsburgh, in the county of Allegheny and State of Pennsylvanla, haveinvented or discovered new and useful Improvements in Retainers forDental Plates, of which the following is a specification.

My invention consists of a new and 1mproved retainer for holding adental plate in place'in the mouth of the wearer.

The retainer consists of a substantially ring-shaped or annular piece ofthin gold, tin or other non-corrosive metal whose base is securedbeneath a ring-like metal flange fixed in the body of the dental plateand whose skirt extends outwardly over said flange and lies upon thesurface of the dental plate. When the plate is in use, said skirtbecomes moist and adheres to the mouth of the wearer, securing thedental plate against accidental loosening and holding it securely yetcomfortably in place, but quickly released by a sudden pull whendesired. The retainer is incorporated in the plate when the latter ismade, but when worn out may be readily removed and a new retainersubstituted.

In the accompanying drawings, Figure 1 is a perspective of a palataldental plate provided with my invention; Fig. 2 is an enlarged plan ofthe card-board pattern; Fig. 3 is a similar view of the serrated metaldisk which is divided to form the flange-member and the center disk; Fig. 4

is a similar view of the thin gold or tin disk from which the retaineris formed; Fig. 5 is a plan View of the metal disk superimposed on saidgold disk, the center of the latter being serrated to form fingers; Fig.6 is a similar view of the annular casing-member for the gold retainer;Fig. 7 is a similar view of the disk-shaped casingmember of saidretainer; Fig. 8 is a similar view showing said retainer incased in saidcasing-members; Fig. 9 is a similar view showing the flange membersuperimposed on the incased retainer, the fingers of the latterextending through the central opening of the former; Fig. 10 1s asimilar view showing the center disk pressed back into place and thefingers of the retainer pressed Specification of Letters Patent.

Patented Mar. 30, 1915.

Application filed July 16, 1912. Serial N 0. 709,781.

flat against the surface of the flange member; Fig. 11 is a plan view ofthe face-plate; Fig. 12 is a similar view showing the-faceplate inposition; Fig. 13 is a section along the line XIII-XIII in Fig. 1; Fig.14 s a perspective of the plaster model with the metal base-platemounted thereon; Fig. 15 1s a similar view showing the structure shownin Fig. 12 mounted on said base plate; F 1g. 16 is a view similar toFig. 1, but showing the casing still inclosing the retainer as thedental plate is lifted from the model after being vulcanized and thebase plate detached. Fig. 17 is a perspective of the dental plate withthe retainer removed, and Fig. 18 is an inverted perspective, onenlarged scale, of the retainer.

The following is a detailed description of the drawings. A is the dentalplate, shown for the sake of illustration as the upper or palatal plate,but my invention is equally applicable to the lower or lingual platewhen the flatness of the wearers mouth requires the retainer to hold theplate in position. I will now describe the preferred process ofmanufacturing the retainer and mounting the same in the dental plateduring the operation of manufacturing the latter.

A piece of thin card-board 1 is cut to the proper dimensions and shapedictated by the size and contour of the dental plate. By means of waX Isecure said pattern to the face of a piece of metal about 30 gage andtrim off the edges of the latter so that it is about inch larger thanthe pattern. The resulting metal disk is serrated at its edges, as at22, inwardly to the edge of the pat tern, the cuts being preferablyalternately radial and oblique, as shown. The pattern is now detachedand the center of the metal disk is out out along a line about inch fromthe bases of the edge serrations 22, forming an annular member B and acenter disk C. The pattern 1 is now placed upon a sheet of thin gold,tin or similar metal, of a thickness of 1/1000 of an inch or thinner,and the said metal, hereinafter referred to as gold is trimmed off evenwith the edge of the pattern, forming a disk from which the retainer ismade. The gold disk, D, is then removed from the pattern and the annulusB superimposed thereon concentrically. I then punch a series of holes3-3 in the disk D around the inner perimeterof the annulus B and removethe annulus. I then cut out of the center of the gold disk D a smallportion, as at 4, and serrate the material of the said gold diskoutwardly to the holes 3-3, thus forming i-nward-lyextending radialfingers 5-5 of substantially truncated, triangular form. The member D ishow in the form of an annulus having a plain circumference mussel-ratesinner perimeter. The member D is now placed upon a sheet bf very thinmetaly'such as thin aluminum, and the same is "punched through the'holes-'33 and "also trimmed arbund the put-sideeven with thecircumferenee of the member I). The center of the aluniihum isnow outoutaround the holes punched therein, remain-g an annulus E. The'inemb'er D is now placed upon another piece of aluminum andthesametrimmed abohtth'e edge toasiae about greater than the memberD;fo1'-mih;ga disk The 'memb'er D is how laidhpon-s'aid disk F-and theannuliis E is 'laid upon"the member'D, the

fingers 5 5' being bent to extend Vertically through the central openingof said annulus Fr. The edge of the annulus E is turned up as-atb inFig.8, thus inclosing said inen'rber D in a casing of very thin metal.The member-B is how *s'uperimposed on" the annulus E, the "fingers '5-5extending vertically hroughthe center of said member, as shown in Fig.9. Ihe centerdiskCis now replaced in the member B, "being pressed downinto place, the edge of'safid center disk and the inner pe'rimeter' ofthe member B having been previously smoothed so' as not to cut the gold.The fingers- 5 5 are now bent down 'fl'at against the- 'ekposedface ofthe member B, as shown in Fig. 10.

Gis' a face plate of similfarmetal to member B and of the same size aspattern 1. Said face late; G, is superimposed"onthe member B and four orlive of the serrations QQiZLl'G bent 'down flat onto said face plateto'hold the'elements now assembled securely together. Theremainin'g'serrations --2 -'2"of the member B are caused to extend at'anangle to the body "of said member. The fingers '5 5 of the member Dareheld flat between the member B and the faceplate G. H5 Figs. 14: and 15,is the plastermod'el previously prepared in the usual manner and upon t1e same I secure by'a little wax a base plate I of about 30gage met'alpr'essed to conform to the irregular surfaceof said model H. I now pressthe assembled eleme'njts shown 'in Fig. 12 'doWnsnu-gly upon theb'a'seplate I, securing the same thereto by a little wax, the casing disk F"resting upon said base plate and the face plate G being exposed. Thedental plate A is "then "molded in the usual manner upon the-model andvulcanized. When removed from the flask, the plate presents theappearance shown in Fig. 16, the aluminum casing disk F being exposed.This disk is torn away by means of a suitable tool and the annulus E isalso likewise removed, exposing the body "or-"skirt of'the'gold retainerD which now lays extended outwardly over the portion of the flangemember B not incorporated in the body of the plate and-over the adjacentface of the dental plate. The

eeiiter 'diskC i-s-"then lifted from its seat.

The presence of the base plate I when the dental plate isbeing-moldedyforms a'circumferential -depression in the lace of the'dental plate A surrounding the exposed portion ofthe ffla'nge memberBfwhich depres- 'sionismarke'di in the drawings. This-de 5 "5 56f theretainer D are tightly clamped between the member-Band the face plateGr. In the center-of the member-B is 'formeda cavity-5 of a depthequal'to the thickness of the base "plate I, the casing disk Ffand-theCenter disk "(l-fth'ebottemkof said cavity'being formed by the faceplate "G.

The s'kirt of- "the retainer 5 D *becoming dampened, "adheres to the"month of the without discomfort, but v'neleasable by a smart jerkerpull. Theretainer, being of metal, does not become destroyedbroffensi've tlir'ohgh the action of the-aeidsof the mouth and is indeedindestructible except possibly by being-torn through rough usage. Insuch ease-,au that "is required is to insert-a sharp tool'or stick undertheedge of the exposed flangamember B to lift said flange sufliciehtly"to withdraw from beneath the same the 'fingers =5 -5. The retainer maythen be removed and anew one inst'ailed by tucking "its fingers 5 5under the flange of member 8' pressing said llange snugly down intoplace again.

If'through the gradual-shrinkageor absorption of the tissue er themouth; the

plate "fitsto'o loosely, I may raise thefiange 'ofrnember iB- slightlyput a filler ring or *other 'fillin'g beneath the same, therebyavenerand hblds the platesnugly in place 'senting its inner perimeter inthe form of a Signed at Pittsburgh, Penna, this 12th holding flange, anda double annulus of thin day of July, 1912.

metal having its base secured under said JOHN S. NAULDER. holding flangeand having its outer portion Witnesses:

5 trailing radially over the top surface of the E. A. LAWRENCE, plate,as and for the purpose set forth. J. H. HARRISON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, .D. 0.

It is hereby certified that Letters Patent No. 1,133,570, granted March30, 1915, upon the application of John S. N aulder, of Pittsburgh,Pennsylvania, for an improvement in Retainers for Dental Plates, wereerroneously issued to John S. Naulder, Whereas said Letters Patentshould have been issued to Tired Naulder, admt'nistmtria: of said JohnS. Naulder, deceased; and that the said Letters Patent should be readWith this correction therein that the same may conform to the record ofthe case in the Patent Oflice.

Signed and sealed this 27th day of April, A. D., 1915.

[SEAL] J. T. NEWTON,

Acting Commissioner of Patents.

